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Finding the Fourth Proportional to 74,690.10, 112,035.15 and 68,987.70

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Solution

The fourth proportional to 74,690.10, 112,035.15 and 68,987.70 is: 103,481.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    74,690.10 : 112,035.15 = 68,987.70 : x
  2. Step 2: Convert to fraction form
    74,690.10/112,035.15 = 68,987.70/x
  3. Step 3: Cross multiply
    74,690.10x = 112,035.15 × 68,987.70
  4. Step 4: Simplify right side
    74,690.10x = 7,729,047,317.66
  5. Step 5: Solve for x
    x = 7,729,047,317.66/74,690.10
  6. Step 6: Final answer
    x = 103,481.55

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.